Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5273280 | Tetrahedron Letters | 2008 | 4 Pages |
A novel fluorescence probe has been synthesized, which consists of o-(carboxamido)trifluoroacetophenone moiety as the recognition element and cyano-1,2-diphenylethylene moiety as the signaling unit. Fluorescence titrations of the probe with anions such as Fâ, Clâ, Iâ, CNâ, SCNâ, AcOâ, H2PO4-, HSO4-, and ClO4- as their Bu4N+ salts in acetonitrile show that CNâ is the most efficient quencher, AcOâ and Fâ follow it, and other anions show little changes. In an aqueous medium, MeOH-water (9:1), the probe shows fluorescence quenching only toward cyanide and no changes toward the other anions.
Graphical abstractA fluorescence probe based on an o-(carboxamido)trifluoroacetophenone binding motif shows selective fluorescence quenching toward cyanide among various anions examined. In particular, the probe responds only to cyanide in aqueous media.Download full-size image